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Difference between revisions of "Placenta"
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→Placental mass: nutty opinion
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==Placental mass== | ==Placental mass== | ||
It is considered routine to obtain a mass for the placenta. This is usually done when the placenta is fresh and with the membranes and cord trimmed, as most tables of placental mass were created with these parameters. | |||
Placental mass by gestational age:<ref>AFIP Placental pathol. ISBN: 1-881041-89-1. P.312</ref> | Placental mass by gestational age:<ref>AFIP Placental pathol. ISBN: 1-881041-89-1. P.312</ref> | ||
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*The change in mass/week is approximately linear and equal to 300 grams / 14 weeks ~ 20 grams/week. | *The change in mass/week is approximately linear and equal to 300 grams / 14 weeks ~ 20 grams/week. | ||
*The spread in mass between 10% and 90%, crudely estimated, is 200 grams (for GA=26-40). | *The spread in mass between 10% and 90%, crudely estimated, is 200 grams (for GA=26-40). | ||
Notes: | |||
*Is it required? | |||
**Sebire and Fox have advocated abandoning the practise of obtaining a placental mass, due to the large number of uncontrolled variables inherent in these measures. Instead, they have advocated using mushy descriptors such as "small", "average" and "large", which require experience in examining the organ.<ref>{{cite book |author= Fox, Harold; Sebire, Neil J. |title=[http://www.amazon.com/Pathology-Placenta-Major-Problems/dp/1416025928/ref=sr_1_fkmr0_1?ie=UTF8&qid=1297259619&sr=1-1-fkmr0 Pathology of the Placenta (Major Problems in Pathology)]|publisher=Saunders |location= |year=2007 |pages= 559-561 |edition=3rd |isbn=978-1416025924 |oclc= |doi= |accessdate=}}</ref> | |||
***In the context of quality, a measure (even if somewhat flawed), is almost certainly more reproducible than arbitrary descriptors which require experience and a continuing case volume to calibrate. | |||
=Overview of placental pathology= | =Overview of placental pathology= | ||